Granted Patent B2

US 11,403,181 · App. 16/778,462 · Granted Aug 2, 2022

Inventors: Subash Rajaa (Pune, IN); Sunil Hasbe (Shirur Anantpal, IN); Anish Vaidya (Pleasanton, CA); Om Prakash Agarwal (Fremont, CA)

Assignee: Veritas Technologies LLC

G06F11/1451G06F11/1464G06F2201/805G06F2201/82

Abstract

Claims (79)

1. A computer-implemented method for managing replication of data to a remote storage device, at least a portion of the method being performed by a computing device comprising at least one processor, the method comprising:

maintaining, on the computing device:

a first bitmap storing data acknowledging persistence of source data at a source gateway; and

a second bitmap storing data acknowledging persistence of target data at a target gateway, wherein:

the target gateway serves the remote storage device; and

the target gateway and the remote storage device are separate devices;

sending replication data in a replication stream from the computing device to the source gateway;

inserting a marker into the replication stream;

receiving, from the target gateway, a first acknowledgement of receipt of the marker after the replication data in the replication stream has been applied to the target device; and

clearing, in response to receiving the first acknowledgement of receipt of the marker, the first bitmap or the second bitmap.

2. The method of claim 1 , further comprising:

maintaining, on the computing device, a third bitmap storing data acknowledging persistence of source data at the source gateway;

switching from using the first bitmap to using the third bitmap prior to clearing the first bitmap; and

clearing the first bitmap.

3. The method of claim 2 , wherein an in/out tap (IOTAP) module manages the switching.

4. The method of claim 1 , further comprising:

maintaining, on the computing device, a third bitmap storing data acknowledging persistence of target data at a target gateway;

switching from using the second bitmap to using the third bitmap prior to clearing the second bitmap; and

clearing the second bitmap.

5. The method of claim 1 , further comprising:

maintaining, on the computing device, a third bitmap storing data acknowledging persistence of source data at the source gateway;

switching from using the third bitmap to using the first bitmap prior to clearing the third bitmap; and

clearing the third bitmap.

6. The method of claim 1 , further comprising:

maintaining, on the computing device, a third bitmap storing data acknowledging persistence of target data at a target gateway;

switching from using the third bitmap to using the second bitmap prior to clearing the third bitmap; and

clearing the third bitmap.

7. The method of claim 1 , further comprising determining a round-trip time of the marker and the first acknowledgement to identify a switching period between the first bitmap and the second bitmap.

8. The method of claim 7 , wherein the switching period is further determined by a recovery point objective time.

9. The method of claim 1 , further comprising:

receiving a second acknowledgement that all data in an off-line bitmap has been received by a respective gateway; and

transferring, in response to receiving the second acknowledgement, bits from the first bitmap to the second bitmap.

10. A system for managing replication of data to a remote storage device, the system comprising:

a memory device;

a maintaining module, stored in the memory device, that maintains, in the system:

a first bitmap storing data acknowledging persistence of source data at a source gateway; and

a second bitmap storing data acknowledging persistence of target data at a target gateway, wherein the target gateway serves the remote storage device,

wherein the target gateway and the remote storage device are separate devices;

a sending module, stored in the memory device, that:

sends replication data in a replication stream from the system to the source gateway; and

inserts a marker into the replication stream;

a receiving module, stored in the memory device, that receives a first acknowledgement from the target gateway, wherein the first acknowledgement acknowledges receipt of the marker after the replication data in the replication stream has been applied to the target device;

a clearing module, stored in the memory device and that clears, in response to receiving the first acknowledgement of receipt of the marker, the first bitmap or the second bitmap; and

at least one physical processor that executes the maintaining module, the receiving module, and the clearing module.

11. The system of claim 10 , wherein:

the maintaining module maintains a third bitmap storing data acknowledging persistence of source data at the source gateway;

the system is configured to switch from using the first bitmap to using the third bitmap prior to clearing the first bitmap; and

the clearing module clears the first bitmap.

12. The system of claim 11 , further comprising an in/out tap (IOTAP) module, stored in the memory device, that manages the switching.

13. The system of claim 10 , wherein:

the maintaining module maintains a third bitmap storing data acknowledging persistence of target data at a target gateway;

the system is configured to switch from using the second bitmap to using the third bitmap prior to clearing the second bitmap; and

the clearing module clears the second bitmap.

14. The system of claim 10 , wherein:

the maintaining module maintains a third bitmap storing data acknowledging persistence of source data at the source gateway;

the system is configured to switch from using the third bitmap to using the first bitmap prior to clearing the third bitmap; and

the clearing module clears the third bitmap.

15. The system of claim 10 , wherein:

the maintaining module maintains a third bitmap storing data acknowledging persistence of target data at a target gateway;

the system is configured to switch from using the third bitmap to using the second bitmap prior to clearing the third bitmap; and

the clearing module clears the third bitmap.

16. The system of claim 10 , wherein the sending module determines a round-trip time of the marker and the first acknowledgement to identify a switching period between the first bitmap and the second bitmap.

17. The system of claim 16 , wherein the sending module further determines switching period by a recovery point objective time.

18. The system of claim 10 , wherein:

the receiving module receives a second acknowledgement indicating all data in an off-line bitmap has been received by a respective gateway; and

the maintaining module transfers, in response to receiving the second acknowledgement, bits from the first bitmap to the second bitmap.

19. A non-transitory computer-readable medium comprising one or more computer-executable instructions that, when executed by at least one processor of a computing device, cause the computing device to:

maintain a first bitmap storing data acknowledging persistence of source data at a source gateway;

maintain a second bitmap storing data acknowledging persistence of target data at a target gateway, wherein:

the target gateway serves the remote storage device; and

the target gateway and the remote storage device are separate devices;

send replication data in a replication stream from the computing device to the source gateway;

insert a marker into the replication stream;

receive, from the target gateway, a first acknowledgement of receipt of the marker after the replication data in the replication stream has been applied to the target device; and

clear, in response to receiving the first acknowledgement of receipt of the marker, the first bitmap or the second bitmap.

20. The non-transitory computer-readable medium of claim 19 , further comprising one or more computer-executable instructions that, when executed by the at least one processor of the computing device, cause the computing device to:

maintain a third bitmap storing data acknowledging persistence of source data at the source gateway;

switch from using the first bitmap to using the third bitmap prior to clearing the first bitmap; and

clear the first bitmap.

Assignments (10)

Priority Claims (1)

Continuity (2)